Sen. Lindsey Graham said President Barack Obama was lying Monday when he said he did not try to cover up what really happened Sept. 11 during the Benghazi attacks.

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The senator spoke on that issue and many others Monday afternoon at his Greenville office.

Graham says he won’t back down in his search for answers into what he calls a coverup by the Obama administration as to what really happened during the Benghazi attacks.

“It’s one thing to put people in harm’s way and not come to their aid. It's another thing to lie about what happened to them,” said Graham.

Graham said for days after the attack, the president denied the attack was an act of terror, manipulating evidence for political gain.

“The first thing that needs to be done is someone needs to be fired for what happened,” said Graham.

The White House responded Monday by saying it has been forthcoming and Graham, like other Republicans, is trying to politicize the issue.

“Who executes some sort of coverup or effort to tamp things down for three days?" said Obama.

Graham also addressed another growing controversy in Washington -- an investigation into the claim that IRS agents targeted conservative tea party groups for extra scrutiny.

“This won't be the first time the IRS has ever been used for political purposes, but like the last time, it needs to be dealt with. I was pleased to hear the president admit this was serious,” said Graham.

“If you've got the IRS operating in anything less than a neutral and nonpartisan way, then that is outrageous,” said Obama.

And finally Graham spoke about gun control, saying there is a reason the president was unable to pass legislation on gun control.

"The president is using a political agenda and demagoguing the gun issue, not solving the problem,” said Graham.

Obama has expressed disappointment in lawmakers for failing to support his gun measure.